Concrete building block



Feb. 27, 1923.

. A. HENDERSON CONCRETE BUILDING BLOCK Filed Aug. 20, 19 21 flzziert Hands/sow.

Patented Feb. 27, 1%23.

UNITE ALBERT nnnnnnson, or PITTSBURGH, P NNSYLVANIA.

CONCRETE BUILDING BLOCK.

Application.filednugust 20, 1921. Serial messed.

- T 0 all whomit may concern:

Be it known that I, ALBERT HENDERSON, a citizen of the United States, residing at Pittsburgh, in the county ofAllegheny and of the blocks will be enabled to eliminate the expensive waste of field forms and eXpe- 'dite erection. The invention insures a constant factor of safety and provides higher allowable concrete stresses. The invention is illustrated in the accompanying drawings,

in which Figure 1 is a perspective view of one embodiment of theinvention, and

Fig. 2 is a section on the line 2-2 of Fig.1.

Fig. 3 is an end view showing a slightly different form of block.

The block, indicated as an entirety by the reference numeral 1, is formed in a suitable mold or otherwise at a central plant and is of a general rectangular form. The corners of the block are all beveled, as shown at 2, and upon the four sidesof the block are formed grooves 3 which impart'to the block an appearance resembling that of brick or stone laid in courses. In the end of each block is a depression or recess 5 defining a continuous marginal seating face and disposed in rectangular relation within each recess are lugs or projections 6 which have a. height preferably. equal to the depth of the'chamber or recess so that the outer surfaces of the lugs or projections will be flush substantially with the end surface or -marginal seating face of theblock. Openings or passages 7 are formed through the block to permit the insertion of reinforcing tie rods therethrough when the blocks are assembled in a beam or column and these passages 7 may be of uniform diameter or flared toward their ends, as illustrated. A reinforcing bail or ring 8 may be embedded in the block in the course of its manufacture and one or moreof such reinforcing,

rings may be employed as desired and according-to the size of; the block. A keyway I 9 maybe formed around all thesides of the block, if desired, so that, when the blocks are brought together in awall or other structure, grout or green cement may be poured 5 into the spaces definedbythe keyways so.

as to firmly lock the blockstogether.

In assembling theblock's ina wall or other structure, the end surfaces or the abutting unite when brought into juxtaposition. The

blocks will be made'in various sizes so that any desired size of wall, column or beam:

can be produced by using the proper number of units of the proper dimensions. i

The blocks may be laid like bricks and no'high degree of skill is required in their The keyway around the sides of the block will be advantageous when the blocks are united in a structure subjected to "hydraulic pressure as a concrete .key may be thereby formed at. all joints.

'While I have referred to the block as a concrete block, it is to be understood that the invention is not limited to a block formed from cement but any plastic material may be used as the substance from produce the block.

In Fig. 3, I have illustrated ahollow block having a single lug or projection and which may be employed where no great strength is needed, and is especially adapted for use in conduits, pipes, telegraph poles, etc; i

In all forms of the block, the grout area in the ends forms an invisible chamber between adjacent blocks assembled in-a wall. Having thus described the invention, what is claimed as new is: I p

1. A concrete building block provided in being substantially flush with the end surface of the block and the lugs being spaced from the sides of the recess.

2. A concrete-building block provided in its end with a recess and lugs within the re which, to 7 its end with a-recess and spaced lugs within said recess, the outer surfacesof said lugs cess, the side walls of the recess being pare allel with the sides ofthe block and the ends withinthe recesses between the side walls of the same and the lugs.

3. A concrete building block of rectangular form having a continuous 'keyway formed in its ends and two of its sides, the ends of the blocks having recesses formed therein with the sides of the recesses parallel with the sides of the block.

A concrete building block provided in its end itha recess and lugs within the recess, the side walls of the recess. being parallel with the sides of the block and the outer sides of the lugs being parallel with the sides of the recess and the faces of the lugs being flush with the end surfaces of the hlock, lo-ngituc'linal passages through the block opening at their ends within the 16-1 ccsses between the side walls of the same and the lugs, and akeyway formed in the ends and two sides of the block and opening at its ends into theirecesses in the ends of the block 5. A concrete building ,block having a recess in each end thereof and defining a continuous marginal seating face, there being longitudinal passages. extending entirely through the block and communicating with said recesses and a projection on each end of the block within the recess with its outer surface disposed substantially flush with the adjacent seating face of the block.

6. A concrete building'block having are cess in each end thereof and defining a continuousmarginal seating face, there'heing longitudinal passages extending entirely through the block at the cornersthei'eof and opposite each side wall and communicating with said recesses and a projection extending from the wall of each recess and spaced from the adjacent marginal seating fare of the block.

In testimony whereof I my signature ALBERT HENDERSON. he 

